Mr. Amos' is probably the most complete and comprehensive, but if I would have started with that book, I would have never started to spin.
I recommend Carol Kroll's,The Whole Craft of Spinning: From the Raw Material to the Finished Yarn
And 'Spinning for Speed and Softness' by Paula Simmons
Once the fiber bug takes hold, check out "In Sheep's Clothing: A Handspinner's Guide to Wool" by Nola Fournier and Jane Fournier
Then when you want to play with color, check out Deb Menz' "Color in Spinning"